[Tilecache] [OpenLayers-Dev] jpeg vs jpg

[Christopher Schmidt]

On Thu, Oct 25, 2007 at 08:57:02AM -0400, Paul Spencer wrote:
> No.  TileCache saves the image with a .jpg extension but uses 'jpeg'  
> for the mime type of the returned content.  The underlying library,  
> PIL, will do that automagically for you.

No. 

1. PIL is not neccesarily involved in transactions. It is only used 
   with meta-tiling, so invoking the name of PIL here is irrelevant.
2. The last parts of the diskcache key are:
     "%03d.%s" % (int(tile.y) % 1000, tile.layer.extension)
3. The Layer class converts the extension:

     if extension.lower() == 'jpg': extension = 'jpeg' # MIME
     self.extension = extension.lower()

Jachym is right. The Layer.TileCache is wrong.

Regards,
-- 
Christopher Schmidt
MetaCarta